United States Trade Representative
Ambassador Jamieson Greer was confirmed by the U.S. Senate as the 20th United States Trade Representative on February 27, 2025. As a key member of President Trump’s cabinet, Ambassador Greer has made it a priority to put America First on trade by combating unfair foreign trade practices, expanding market access for Made in America products, and ensuring the United States has balance and reciprocity in its trading relationships.
Ambassador Greer returns to USTR after previously serving as Chief of Staff to Ambassador Robert Lighthizer during President Trump’s first term. In that role, he was deeply involved in the Administration’s implementation of tariffs on China and subsequent negotiation of the U.S.-China Phase One Agreement. He also was a critical part of USTR’s efforts to negotiate, and obtain congressional approval for, the U.S.-Mexico-Canada Agreement (USMCA).
Outside of government service, Ambassador Greer was a partner at a Washington law firm where his practice focused on international trade and national security issues. Earlier in his career, Ambassador Greer served in the U.S. Air Force Judge Advocate General’s Corps, including a deployment to Iraq.
He received his J.D. from the University of Virginia School of Law and a joint Master in Global Business Law from l’Institut d’Etudes Politiques de Paris (Sciences Po) and l’Université de Paris I Panthéon-Sorbonne. He graduated with a B.A. in International Studies from Brigham Young University.
Front Office
Chief of Staff — Sam Mulopulos
Deputy Chief of Staff — Zoe Sophos
Senior Director for Policy — Joe Sullivan
Senior Director for Policy — Tia Potskhverashvili
Executive Secretary — Michael Starr
Director of Operations and Protocol — Kimberly Morrall
Deputy Director of Scheduling — Rosalyn Hollingsworth
Special Assistant — Tony Crnkovich
Special Assistant — Aidan Doud
Office of the General Counsel
General Counsel — Jennifer Thornton
Adviser to the General Counsel — Kwan Kim
Office of Congressional Affairs
Assistant U.S. Trade Representative for Congressional Affairs — Brett Doyle
Deputy Assistant U.S. Trade Representative for Congressional Affairs — Larry Calhoun
Senior Director for Congressional Affairs — Duncan Braid
Director for Congressional Affairs — Keyden Smith-Herold
Office of Intergovernmental Affairs and Public Engagement
Assistant U.S. Trade Representative for Intergovernmental Affairs and Public Engagement — Jennifer Bang
Director for Intergovernmental Affairs and Public Engagement — Marshall Stallings
Director for Intergovernmental Affairs and Public Engagement — Lauren Baldwin
Office of Public and Media Affairs
Deputy Assistant U.S. Trade Representative for Public and Media Affairs — Kate Lair
Director for Public and Media Affairs — Madeline Yarbrough
Assistant U.S. Trade Representatives and Other Senior Officials
Assistant U.S. Trade Representative for Economic Affairs — Laurie-Ann Agama
Assistant U.S. Trade Representative for Administration — Fred Ames
Assistant U.S. Trade Representative and Deputy Chief of Mission, Geneva — David Bisbee
Assistant U.S. Trade Representative for Agricultural Affairs and Commodity Policy — Julie Callahan
Assistant U.S. Trade Representative for Small Business, Market Access, and Industrial Competitiveness — Sushan Demirjian
Assistant U.S. Trade Representative for Southeast Asia and the Pacific — Sarah Ellerman
Acting Assistant U.S. Trade Representative for Japan, Korea, and APEC Affairs — Scott Pietan
Assistant U.S. Trade Representative for Africa — Constance Hamilton
Assistant U.S. Trade Representative for Innovation and Intellectual Property — Daniel Lee
Assistant U.S. Trade Representative for South and Central Asia — Brendan Lynch
Assistant U.S. Trade Representative for Labor Affairs — Katy Mastman
Assistant U.S. Trade Representative for China, Mongolia and Taiwan Affairs — Terrence J. McCartin
Assistant U.S. Trade Representative for Environment and Natural Resources — Kelly Milton
Assistant U.S. Trade Representative for WTO and Multilateral Affairs — Neil Beck
Assistant U.S. Trade Representative for Services and Investment — Kenneth Schagrin
Assistant U.S. Trade Representative for Europe and the Middle East — Bryant Trick
Assistant U.S. Trade Representative for the Western Hemisphere — Daniel Watson
Deputy General Counsel for Monitoring and Enforcement — Juan Millán
Deputy General Counsel for Negotiations, Legislation, and Administrative Law — Arthur Tsao
